Flat spring arrangement for use on a spring wire mesh

ABSTRACT

A flat spring for use in spring wire mesh for chairs and beds. The spring wire is bent in substantially zigzag for with the sections of the wire which lie between the apex portions bent further outwardly thereby enabling improved longitudinal and transvers extension.

Unite States etent Otto P. Molt Haubersbronn, Wurttemberg, Germany 812,110

Apr. 1, 1969 Feb. 2, 1971 lnventor Appl. No Filed Patented FLAT SPRINGARRANGEMENT FOR USE ON A SPRING WIRE MESH 6 Claims, 3 Drawing Figs.

U.S. Cl 267/144, 245/2 Int. Cl A47c 23/16 Field of Search 267/ 1 10,

[56] References Cited UNITED STATES PATENTS 2,319,684 5/1943 Horton267/110 3,258,260 6/1966 Olson 267/110 Primary ExaminerArthur L. LaPoint Attorney-Sparrow and Sparrow $3 ai A flwk f R mfi 1W M f r) 3 JJIMJ) PATENTEU FEB 2|91| H F; 7 L W 1 INVENTOR Otto no;

BY sva vbw 1AA air I ATTORNEYS FLAT SPRING ARRANGEMENT FOR USE ON ASPRING WIRE MESH This invention relates to a flat spring arrangement foruse on a spring wire mesh for chairs, beds and the like. having coursesof spring wire tensioned between oppositely disposed sides of a frame.

With known spring wire meshes of this type, the individual flat springscan be expanded independently of one another only in their longitudinaldirection. Consequently, they must be made of a comparatively. strongspring wire, in order to withstand the peak loads which occur in theirregion.

The invention has for its object to provide a flat spring wire meshwhich can be more favorably stressed.

According to the invention, there is provided a flat spring for use in aspring wire mesh for chairs, beds and the like, having courses of springwire tensioned between frame sides which face one another, wherein thespring wire is bent in substantially zigzag form in one plane andwherein those sections of the spring wire which lie between apexpositions of the zigzag are once again bent outwardly in the same plane.

The spring wire mesh is now capable of extending longitudinally andtransversely of the flat springs as well as in an oblique positionextending therebetween, and thus practically in all directions, sincethe additional outward bending between the apex positions provides aspring action transversely and diagonally. Any load is thus distributedover the entire spring wire mesh. This has the result that similar loadconditions can be controlled with a thinner spring wire, i.e. with useof less material.

The bending angle at the apex positions is preferably about 90, and allwire sections, namely, those which extend longitudinally andtransversely of the flat spring as well as those extending obliquelythereto, have the same length. This constructional form is particularlyadvantageous, because with this construction, the spring wire mesh canstretch in all directions to the same extent.

In the accompanying drawing:

FIG. 1 is a plan view of a spring wire mesh according to the invention,

FIG. 2 shows a section of a flat spring to a larger scale,

FIG. 3 is a section on the line III-III of FIG. 1.

Referring to FIG. 1, the spring wire mesh has a rectangular frame 1 withsides la, lb, 10 and 1d, which can be made of wood, metal or any othersuitable material. Tensioned between the facing frame sides In, and 1care flat springs 2, in which the spring wire extends in substantiallyzigzag form around a mean axis 12 (FIG. 2). The spring wire sectionsbetween the apex positions of the zigzag course are indicated at 3 andare bent outwardly in the same plane so that a section 4 extendinglongitudinally of the flat spring and a section 5 extending transverselyof the flat spring are formed. The remaining two wire sections 6 extendobliquely of the length of the flat spring.

The flat springs 2 are fixed by means of staples 9 to the frame sides laand 10 which extend transversely of their length by means of ends 7,which correspond to the wire sections 5.

Adjacent flat springs are connected by wire staples 10 at their apexpositions 3 which face one another, so as to be resistant to tension(see FIG. 3). In this way, a wire mesh is formed which is so mounted inthe frame that it has approximately the same pretension in both maindirections of the plane of the frame. It is to be appreciated that thewire mesh according to the invention can resiliently transmit the forcesin all directions.

In the constructional example, the angle a at the apex positions issubstantially and the wire sections 4, 5 and 6 have the same length.

The relatively sharp bending of the spring wire, as shown in theconstructional example, is advantageous on manufacturing grounds.Furthermore, the wire staples 10 in the sharp corners have a secureposition and cannot be displaced so as to cause noise. For certainpurposes of use, however, a more strongly rounded formation can also beadvanta eous.

Numerous modifications of the constructiona form as lllLlS- trated arepossible within the scope of the invention. By way of example, theoutwards bends 4, 5 instead of always being on one side, can also bebent alternately in an outward and inward direction. The presentconstructional form provides a particularly uniform surface loading andis advantageous on manufacturing grounds.

I claim:

I. A flat spring for use in a spring wire mesh for chairs, beds and thelike, having courses of spring wire tensioned between frame sides whichface one another, wherein the spring wire is bent in substantiallyzigzag form in one plane and wherein those sections of the spring wirewhich lie between apex positions of the zigzag are once again bentoutwardly in the same plane.

2. A flat spring according to claim 1, wherein sections of the springwire follow one another along the length of the flat spring in thefollowing order, an apex position, a section extending obliquely towardsthe mean axis of the spring wire, a section extending in the directionof the mean axis, a section extending transversely of the mean axis, asection extending obliquely away from the mean axis, an apex position, asection extendingobliquely towards the mean axis, a section (5)extending transversely of the mean axis, a section extending in thedirection of the mean axis and a section extending obliquely away fromthe mean axis.

3. A flat spring according to claim 1, wherein the outwardly bentportions in the sections between the apex positions lie substantially inthe middle between the apex positions.

4. A flat spring according to claim 1, wherein the bending angle at theapex positions is about 90, and all wire sections have the same length.

5. A flat spring according to claim 1, wherein the sections aresubstantially rectilinear.

6. A spring wire mesh comprising flat springs according to any of claim1, wherein adjacent flat springs are connected to one another at theirfacing apex positions so as to resist tension and to outer flat springsare similarly connected to those sides of the frame which extendparallel to them.

1. A flat spring for use in a spring wire mesh for chairs, beds and thelike, having courses of spring wire tensioned between frame sides whichface one another, wherein the spring wire is bent in substantiallyzigzag form in one plane and wherein those sections of the spring wirewhich lie between apex positions of the zigzag are once again bentoutwardly in the same plane.
 2. A flat spring according to claim 1,wherein sections of the spring wire follow one another along the lengthof the flat spring in the following order, an apex position, a sectionextending obliquely towards the mean axis of the spring wire, a sectionextending in the direction of the mean axis, a section extendingtransversely of the mean axis, a section extending obliquely away fromthe mean axis, an apex position, a section extending obliquely towardsthe mean axis, a section (5) extending transversely of the mean axis, asection extending in the direction of the mean axis and a sectionextending obliquely away from the mean axis.
 3. A flat spring accordingto claim 1, wherein the outwardly bent portions in the sections betweenthe apex positions lie substantially in the middle between the apexpositions.
 4. A flat spring according to claim 1, wherein the bendingangle at the apex positions is about 90*, and all wire sections have thesame length.
 5. A flat spring according to claim 1, wherein the sectionsare substantially rectilinear.
 6. A spring wire mesh comprising flatsprings according to any of claim 1, wherein adjacent flat springs areconnected to one another at their facing apex positions so as to resisttension and to outer flat springs are similarly connected to those sidesof the frame which extend parallel to them.